. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. DEGLUTITION. 309 coming together, lie together like side-screens or curtains (Landois), meet the raised dorsum of the tongue, and so form a partition between the mouth and pharynx; the occlusion is still further assisted by the contraction of the stylo-glossi muscles, which elevate the tongue and press it against the palate. The second stage of deglutition then commences, and the bolus of food is now entirely beyond the control of the will, and must pass down the pharynx into the oesophagus, its ejection i
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. DEGLUTITION. 309 coming together, lie together like side-screens or curtains (Landois), meet the raised dorsum of the tongue, and so form a partition between the mouth and pharynx; the occlusion is still further assisted by the contraction of the stylo-glossi muscles, which elevate the tongue and press it against the palate. The second stage of deglutition then commences, and the bolus of food is now entirely beyond the control of the will, and must pass down the pharynx into the oesophagus, its ejection into the mouth again only. Fig. 130.—Position of the Soft Palate during the Second Stage of the Act of Deglutition, after Fiaux. (Mayer.) A, soft palate; C, bolus; E, orifice of Eustachian tube; B, tongue; G, pharynx; H, epiglottis; i, ccsophagus. being rendered possible by an active coughing or gagging movement. Its downward movement during this stage, which lasts while the food is passing from the anterior pillars of the fauces to the entrance of the oesophagus, is still attended by sensation. The muscular movements of the second stage of deglutition are much more complex than in the first. The pharynx communicates with three cavities,—the posterior nasal chamber, the oesophagus, and the larynx. Special mechanisms exist which direct the food downward toward. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Robert Meade, 1854-. Chicago, A. Eger
Size: 1343px × 1861px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiologycomparativ
